SM811
Hi Ladies and Gentlemen,
Simple (or maybe difficult) question I have about HI. Could you tell (explain) me what exactly is doing SM811? (Setup is: PM865(Red), SM811(Red) with SM link, BC810(Red))? What does SM811 supervise? Somehow informations in Safety Manual are not so clear for me or maybe I don't understand.
Thanks a lot for answer
with best regards
Voted best answer
One of the example of diagnostics running in SM811 is mentioned in safety manual. Please search for VMT in safety manual.
Another example is "safe peer to peer communication" including CRC checks, Sequence errors, frame corruption etc.
Answers
As far as I know, SM run a copy of the SIL application and compare its own calculations with the ordinary processor. SM also supervise hardware.
In case of disagreement or hardware fault, a shutdown is initiated.
Hi,
The main function of the SM811 is to act as a monitor for the hardware and software execution of PM865. The safety module SM811 is a CEX Module, based on SM810. It provides intelligent supervision of a controller (AC800M) during nonSIL & SIL1-2 and SIL3 application.
Also,as we use SM811 & BC810 configuration for our SIL application, that means a AC800HI REDUNDANT configuration.
Extra benefit of SM811 with BC810 , is:
It adds extra Redundancy to our PLC configuration.
That means your complete system later will have QUADRAPLE REDUNDANCY.
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